Propeller Shaft - Stern tube Liner

Created a liner for a 6mm Stern tube. (peter has designed the hull for 8mm shaft)
On the local r/c store i bought the parts to complete the built of the utility Ship of peter there was no 8mm stern tube shaft and the only option was 6mm stern tube and 4mm shaft.
the only way was this,created liners and placed on the hole,each shaft i used 3 pcs and glue with loctite glue,then cut the excess and install the 6mm shaft.
Inner Diameter is 6.35mm
Outer Diameter:7.8mm